OH Terminated PDMS Base for Neutral Weatherproof Sealant CAS 70131-67-8 Raw Material
OH Terminated PDMS Base is hydroxyl‑terminated polydimethylsiloxane, also known as 107 silicone rubber, CAS 70131‑67‑8. It is tailored as base polymer for neutral weatherproof sealant. It has good compatibility with oxime and alkoxy cross‑linkers, and excellent wetting capacity for inorganic fillers. Cured sealant exhibits high elasticity, anti‑ageing and UV‑resistant properties, widely applied in outdoor building weather‑resistant sealing and joint filling
Product Overview
OH Terminated PDMS Base is hydroxyl‑terminated polydimethylsiloxane (107 silicone base polymer), CAS 70131‑67‑8. Developed for neutral weatherproof sealant, this condensation‑cure polymer owns precisely controlled hydroxyl value and stable viscosity. It can cooperate perfectly with neutral cross‑linking systems, providing long‑term weathering and UV resistance for cured sealants. Rigorous quality inspection ensures consistent performance for continuous industrial production.
Key Features
- Specially optimized for outdoor neutral weatherproof sealant formulation
- Controlled reactive hydroxyl groups for stable neutral condensation cross‑linking
- Great compatibility with oxime‑type and alkoxy‑type silane cross‑linkers
- Excellent dispersibility with fumed silica, calcium carbonate and other fillers
- Cured product delivers superior UV resistance and long‑term weather stability
- High elasticity and low‑modulus performance for movement‑absorbing joints
- Low volatile content, good batch‑to‑batch uniformity
Main Applications
- Outdoor neutral weatherproof silicone sealant
- Building exterior joint sealing adhesive
- Neutral oxime‑type and alcohol‑type silicone sealant
- Condensation‑cure RTV silicone rubber for construction
- Weather‑resistant sealing compound for curtain wall auxiliary application
- Custom neutral silicone formulation requiring long‑term outdoor durability
Processing Suggestions
All feeding, kneading and dispersion operations should be finished under moisture‑isolated environment. Formulate together with neutral cross‑linking agent, organometallic catalyst and reinforcing fillers. Adjust filler proportion and auxiliary additives according to target extrusion rate, hardness and elongation. Prevent moisture invasion in the whole manufacturing process to avoid early cross‑linking.
Storage & Packing
Store in cool, dry and ventilated storage area. Keep iron drum tightly sealed. Keep away from moisture, heat sources and direct sunlight. Reseal container immediately after partial material usage. Maintain recommended storage environment to guarantee complete shelf‑life and polymer reactivity.
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